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| Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters |
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| LA7SJA:
--- Quote from: EEVblog on March 22, 2015, 11:02:29 pm --- --- Quote from: LA7SJA on March 22, 2015, 02:29:26 pm ---DC + AC is bordering useless |O --- End quote --- Perhaps I missed some talk on this, but why is it useless? --- End quote --- If I prefere to take out the Fluke 287 to messure the AC component continusly then I would not us this function, meaning it is of no use to me. BORDERING useless in my opinion. Just my 2 THB. Johan-Fredrik |
| KedasProbe:
--- Quote from: dadler on March 23, 2015, 12:08:30 am --- --- Quote from: EEVblog on March 22, 2015, 11:02:29 pm --- --- Quote from: LA7SJA on March 22, 2015, 02:29:26 pm ---DC + AC is bordering useless |O --- End quote --- Perhaps I missed some talk on this, but why is it useless? --- End quote --- Here is a video of how it behaves: https://www.dropbox.com/sc/rhipa3yvs3va7n4/AAD9qqdHhSSUO4vlQeKKYIWBa --- End quote --- I would probably also find this fluctuating refresh rate to annoying to use. Maybe for very slow changing measurement it would be ok. |
| economist:
--- Quote from: dadler on March 23, 2015, 12:08:30 am --- --- Quote from: EEVblog on March 22, 2015, 11:02:29 pm --- --- Quote from: LA7SJA on March 22, 2015, 02:29:26 pm ---DC + AC is bordering useless |O --- End quote --- Perhaps I missed some talk on this, but why is it useless? --- End quote --- Here is a video of how it behaves: https://www.dropbox.com/sc/rhipa3yvs3va7n4/AAD9qqdHhSSUO4vlQeKKYIWBa --- End quote --- I have a new Keithley DMM7510 and it does the same thing if you are measuring DC and have AC as a secondary measurement. The relay clicking is a little faster, however. |
| dadler:
--- Quote from: economist on March 23, 2015, 07:53:54 pm --- --- Quote from: dadler on March 23, 2015, 12:08:30 am --- --- Quote from: EEVblog on March 22, 2015, 11:02:29 pm --- --- Quote from: LA7SJA on March 22, 2015, 02:29:26 pm ---DC + AC is bordering useless |O --- End quote --- Perhaps I missed some talk on this, but why is it useless? --- End quote --- Here is a video of how it behaves: https://www.dropbox.com/sc/rhipa3yvs3va7n4/AAD9qqdHhSSUO4vlQeKKYIWBa --- End quote --- I have a new Keithley DMM7510 and it does the same thing if you are measuring DC and have AC as a secondary measurement. The relay clicking is a little faster, however. --- End quote --- Hmm. Darn? I was hoping it was a bug. My Brymen BM869 and Fluke 287 seem to handle DC+AC just fine. Granted, at no where near the same accuracy/resolution. But still. Thanks for the data-point. |
| economist:
--- Quote from: dadler on March 23, 2015, 08:01:57 pm ---Hmm. Darn? I was hoping it was a bug. My Brymen BM869 and Fluke 287 seem to handle DC+AC just fine. Granted, at no where near the same accuracy/resolution. But still. Thanks for the data-point. --- End quote --- I was thinking the same thing (that hand held meters with secondary display seem not to have this issue) and thought perhaps the cause was the resolution. But, turning down the resolution on the DMM7510 does not change things -- I still get that clicking relay. I also have an Agilent 34461a with the latest firmware and it is doing exactly what your 34470a is doing in the video. I agree with you that this makes secondary AC display just about useless in practice. |
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